Granted Patent
Utility
US 5,083,887 · App. 07/239,728
Helical cutting tool
Inventor:
Amram Dotany
Patented Case
View Patent ↗
Granted: Jan 28, 1992
Filed: Sep 2, 1988
Inventor
Amram Dotany
Assignee (at issue)
Abraham Cohen
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.